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A conducting rod, with a resistor of res...

A conducting rod, with a resistor of resistance R. is pulled with constant speed v on a smooth conducting rail as shown in figure. A constant magnetic field `vecB` is directed into the page. If the speed of the bar is doubled, by what factor does the rate of heat dissipation across the resistance R change?

A

0

B

`sqrt(2)`

C

`2`

D

`4`

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